7Be(n,p)7Li Reaction and the Cosmological Lithium Problem: Measurement of the Cross Section in a Wide Energy Range at n_TOF at CERN
L. Damone et al.
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05/03/2020

Absolute efficiency calibration of 6LiF-based solid state thermal neutron detectors
P. Finocchiaro, L. Cosentino, S. Lo Meo, R. Nolte, D. Radeck
The demand for new thermal neutron detectors as an alternative to 3He tubes in research, industrial, safety and homeland security applications, is growing. These needs have triggered research and development activities about new generations of thermal neutron detectors, characterized by reasonable e
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05/03/2020

An embedding technique to determine ττ backgrounds in proton-proton collision data
A. M. Sirunyan et al. (CMS Collaboration)
An embedding technique is presented to estimate standard model ττ backgrounds from data with minimal simulation input. In the data, the muons are removed from reconstructed μμ events and replaced with simulated tau leptons with the same kinematic properties. In this way a set of
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05/03/2020

Applying an anti-coincidence system plastic-HPGe to lower the MDA of radioxenon measurement
Flavia Rossi, Paolo Bartolomei, Ruggero Lorenzelli, Stefano Salvi, Antonietta Rizzo, Chiara Telloli, Domiziano Mostacci
The international monitoring system (IMS) has been developed to verify compliance with the comprehensive nuclear test-ban treaty (CTBT). IMS associated with radionuclide monitoring stations allow identifying underground nuclear explosions. Among the fission products created by a nuclear test, the fo
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Characterization and first test of an i-TED prototype at CERN n_TOF
V. Babiano-Suarez et al. (The n_TOF Collaboration)
Neutron capture cross section measurements are of fundamental importance for the study of the slow process of neutron capture, so called s-process. This mechanism is responsible for the formation of most elements heavier than iron in the Universe. To this aim, installations and detectors have been d
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05/03/2020

Combination of CMS searches for heavy resonances decaying to pairs of bosons or leptons
A. M. Sirunyan et al. (CMS Collaboration)
A statistical combination of searches for heavy resonances decaying to pairs of bosons or leptons is presented. The data correspond to an integrated luminosity of 35.9 fb−1 collected during 2016 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV.
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05/03/2020

Combinations of single-top-quark production cross-section measurements and |fLV Vtb| determinations at √s = 7 and 8 TeV with ATLAS and CMS experiments
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Dual-modality imaging with a ultrasound-gamma device for oncology
Fabbri, P. Bennati, V. Orsolini Cencelli, R. Pani
Recently, dual-modality systems have been developed, aimed to correlate anatomical and functional information, improving disease localization and helping oncological or surgical treatments.
Moreover, due to the growing interest in handheld detectors for preclinical trials or small animal imaging, i
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05/03/2020

ENEA 14C laboratory update
A. Rizzo, C. Telloli, P. Bartolomei
We report on the status and capabilities of the ENEA 14C Laboratory. After a technical evaluation, ENEA decided to move the entire laboratory - including equipment and personnel - in a new location at the main headquarters in Bologna (Italy). The laboratory was definitely closed in November 2014 and
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05/03/2020

Environment reference state and specimen bank for radioactive waste disposal
Stable and radioactive isotopes environmental monitoring
C. Telloli, A. Rizzo
Before designing the construction of a repository, preliminary data must be collected to characterize the site, including identifying the Zero State, which define the conditions of all the environmental parameters in order to verify in the future whether the construction and operation of the deposit
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05/03/2020

Evolution of IERs
A. Rizzo, S. Bruni, A. Gessi, G. Marghella, L. Moretti, C. Telloli, P. Bartolomei, A. Luce
Introduction: Ion exchange resins (IERs) are commonly used in PWR nuclear reactors as filters for 14C impurities. Their efficiency, both as filters and as waste containers, is strictly connected with their morphology. The preservation of the spherical shape of both cationic and anionic resins in tim
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05/03/2020

Experimental setup and procedure for the measurement of the 7Be(n,p)7Li reaction at n_TOF
M. Barbagallo et al.
Following the completion of the second neutron beam line and the related experimental area (EAR2) at the n_TOF spallation neutron source at CERN, several experiments were planned and performed. The high instantaneous neutron flux available in EAR2 allows to investigate neutron induced reactions with
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05/03/2020

First Measurement of 72Ge(n,g) at n-TOF
M. Dietz et al.
The slow neutron capture process (s-process) is responsible for producing about half of the elemental abundances heavier than iron in the universe. Neutron capture cross sections on stable isotopes are a key nuclear physics input for s-process studies. The 72Ge(n, γ) cross section has an import
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GALAXY SERPENT v3 Exercise
G. Ottaviano, A. Rizzo, C. Telloli, F. Rocchi, F. Padoani
ENEA has participated to a Nuclear Forensic exercise: the Galaxy Serpent exercise, version 3, focused on the investigation on imported uranium ore concentrate materials. The used approach, the tools and the main outcomes will be presented. The scenario was dealing with the interception of a transpor
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05/03/2020

GEANT4 simulations of a novel 3He-free thermalization neutron detector
A. Mazzone, P. Finocchiaro, S. Lo Meo, N. Colonna
A novel concept for 3He-free thermalization detector is here investigated by means of GEANT4 simulations. The detector is based on strips of solid-state detectors with 6Li deposit for neutron conversion. Various geometrical configurations have been investigated in order to find the optimal solution,
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05/03/2020

Inclusive search for supersymmetry in pp collisions at √s = 13 TeV using razor variables and boosted object identification in zero and one lepton final states
A. M. Sirunyan et al.
An inclusive search for supersymmetry (SUSY) using the razor variables is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 35.9 fb−1, collected with the CMS experiment in 2016 at a center-of-mass energy of s√=13 TeV. The search looks
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Isotopic laser spectroscopy for d13C ratio of explosion products
A. Rizzo, C. Telloli, P. Bartolomei, F. Manassero, G. Ottaviano, D. Castellucci
Characterizing recovered explosives from a bombing or accidents and finding distinctive markers is crucial to clarify the threat and to follow up the emergency.
Here we want to focus on the discrimination of an explosive using specific isotope ratio as carbon (d13C), nitrogen (N) ones. The capabil
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05/03/2020

Lesson learned on the engagement of women in nuclear science and technology
A. Rizzo
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05/03/2020

Measurement of 73Ge(n, γ) cross sections and implications for stellar nucleosynthesis
C. Lederer-Woods et al.
73Ge() cross sections were measured at the neutron time-of-flight facility n_TOF at CERN up to neutron energies of 300 keV, providing for the first time experimental data above 8 keV. Results indicate that the stellar cross section at keV is 1.5 to 1.7 times higher than most theoretical predictions
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05/03/2020

Measurement of the 244Cm and 246Cm Neutron-Induced Cross Sections at the n_TOF Facility
V. Alcayne et al. (The n_TOF Collaboration)
The neutron capture reactions of the 244Cm and 246Cm isotopes open the path for the formation of heavier Cm isotopes and heavier elements such as Bk and Cf in a nuclear reactor. In addition, both isotopes belong to the minor actinides with a large contribution to the decay heat and to the neutron em
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05/03/2020

Measurement of the 70Ge(n,g) cross section up to 300 keV at the CERN n_TOF facility
A. Gawlik et al. (The n_TOF Collaboration)
Neutron capture data on intermediate mass nuclei are of key importance to nucleosynthesis in the weak component of the slow neutron capture processes, which occurs in massive stars. The (n,γ) cross section on 70Ge, which is mainly produced in the s process, was measured at the neutron time-of-f
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Measurement of the radiative capture cross section of the s-process braching points 204Tl and 171Tm at the n_TOF facility (CERN)
A. Casanovas et al.
The neutron capture cross section of some unstable nuclei is especially relevant for s-process nucleosynthesis studies. This magnitude is crucial to determine the local abundance pattern, which can yield valuable information of the s-process stellar environment. In this work we describe the neutron
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05/03/2020

Measurement of the t¯t production cross section, the top quark mass, and the strong coupling constant using dilepton events in pp collisions at √s = 13 TeV
A. M. Sirunyan et al.
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05/03/2020

Measurement of the top quark mass in the all-jets final state at √s = 13 TeV and combination with lepton+jets channel
A. M. Sirunyan et al.
A top quark mass measurement is performed using 35.9fb−1 of LHC proton–proton collision data collected with the CMS detector at s√=13TeV . The measurement uses the tt¯ all-jets final state. A kinematic fit is performed to reconstruct the decay of the tt¯ system and suppress the multijet
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05/03/2020

Measurement of the top quark polarization and t spin correlations using dilepton final states in proton-proton collisions at √s = 13 TeV
A. M. Sirunyan et al. (The CMS Collaboration)
Measurements of the top quark polarization and top quark pair (tt¯) spin correlations are presented using events containing two oppositely charged leptons (e+e−, e±μ∓, or μ+μ−) produced in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were r
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05/03/2020

Measurement of the top quark Yukawa coupling from t kinematic distributions in the lepton + jets final state in proton-proton collisions at √s = 13 TeV
A. M. Sirunyan et al. (The CMS Collaboration)
Results are presented for an extraction of the top quark Yukawa coupling from top quark-antiquark (tt¯) kinematic distributions in the lepton plus jets final state in proton-proton collisions, based on data collected by the CMS experiment at the LHC at s√= 13 TeV, corresponding to an integrate
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Measurements of the Higgs boson width and anomalous HVV couplings from on-shell and off-shell production in the four-lepton final state
A. M. Sirunyan et al. (CMS Collaboration)
Studies of on-shell and off-shell Higgs boson production in the four-lepton final state are presented, using data from the CMS experiment at the LHC that correspond to an integrated luminosity of 80.2 fb−1 at a center-of-mass energy of 13 TeV. Joint constraints are set on the Higgs boson total
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05/03/2020

Monitoring techniques for Cl2 and CO2 de-absorbed from irradiated graphite
A. Ubaldini, B. Ferrucci, A. Strafella, C. Telloli, A. Rizzo
Chlorine is present in nuclear grade graphite as a result of the purification processes during which it remains trapped within the graphite structures. Prior to irradiation, chlorine is present at natural isotopic abundance levels (as Cl-35). During the irradiation, part of it forms Cl-36, in propor
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05/03/2020

Multielement profiling by ICP-MS in food traceability
C. Telloli, A. Rizzo
Fingerprinting techniques based on elemental composition and multivariate statistical analysis of compositional data can be used for the identification and classification of a specific agricultural product according to its geographical provenance. The analytical approach assumes that the elemental c
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05/03/2020

Neutron detection devices with 6LiF converter layers
P. Finocchiaro, L. Cosentino, S. Lo Meo, R. Nolte, D. Radek
The demand for new thermal neutron detectors as an alternative to 3He tubes in research, industrial, safety and homeland security applications, is growing. These needs have triggered research and development activities about new generations of thermal neutron detectors, characterized by reasonable e
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05/03/2020

Observation of Higgs Boson Decay to Bottom Quarks
A. M. Sirunyan et al.
The observation of the standard model (SM) Higgs boson decay to a pair of bottom quarks is presented. The main contribution to this result is from processes in which Higgs bosons are produced in association with a W or Z boson (VH), and are searched for in final states including 0, 1, or 2 charged l
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05/03/2020

Observation of single top quark production in association with a Z boson in proton-proton collisions at √s = 13 TeV
A. M. Sirunyan et al.
The observation of single top quark production in association with a Z boson and a quark (tZq) is reported. Events from proton-proton collisions at a center-of-mass energy of 13 TeV containing three charged leptons (either electrons or muons) and at least two jets are analyzed. The data were collect
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